Slot machine button

I stayed at the hotel with my mom and sister at end of October last year. I was 24 then and my sister was 20 (her birthday is the end of December, so it was about 2 months before she was turning 21). I played slot machine at a casino in the hotel where I stayed. My sister pushed the slot machine button about 3-4 times while I’m playing, and we got caught by the security. All three of us didn’t realize that my sister was a minor at that time. (I guess we were so excited that we made some money out of the slot machine and in my home country, the legal age for a casino is 18). We admit that it was a mistake and apologize.